AlarmManager or WakefulBroadcastReceiver doesn't work when screen is locked AND app is in background on some devices

Question

EDIT: Since I posted the question I've tested the app on numerous devices and also on emulator and apparently the problem wasn't with the app but with the phone I was testing it at the beginning. But now I am curious why on some phones AlarmManager or WakefulBroadcaastReceiver (I don't really know which one is it) doesn't work when app is in the background and screen is locked. Can I somehow fix it via code or in device's options? I will also add that the phone that I was testing it on and wasn't working was Huwaei P8 Lite with Android 5.0.1

Original question:

I am using AlarmManager in my app to display notifications in some time intervals. It works fine when app is open or when the app is in background ( for example after I press home button). It also works when I lock phone screen while app is active. But when I lock the phone when my app is in the background my BroadcastReceiver isn't being called by AlarmManager. Why is that? The problem is even in AlarmManager or maybe rather in my receiver?

Also I have bonus question: Is it possible for my alarm in AlarmManager to work after app is killed?

Here is my code:

public class NotificationService extends IntentService {

public NotificationService(String name) {
    super(name);
}
public NotificationService() {
    super("NotificationService");
}

@Override
protected void onHandleIntent(Intent intent) {                 
        NotificationManager notificationManager = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        Notification notification = new Notification.Builder(this).setContentTitle("TEXT")
                .setContentText("TEXT")
                .setLights(Color.GREEN,1000,500)
                .setSmallIcon(R.drawable.ic_event_white_24dp).getNotification();
        notificationManager.notify(0,notification);

            AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
            Intent i = new Intent(this,AlarmReceiver.class);
            PendingIntent pi = PendingIntent.getBroadcast(this,0,i,0);
            long nextAlarm = System.currentTimeInMillis()+1000*60;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            AlarmManager.AlarmClockInfo alarmClockInfo = new AlarmManager.AlarmClockInfo(nextAlarm, pi);
            alarmManager.setAlarmClock(alarmClockInfo, pi);
            }else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            alarmManager.setExact(android.app.AlarmManager.RTC_WAKEUP, nextAlarm, pi);
            }else {
            alarmManager.set(android.app.AlarmManager.RTC_WAKEUP, nextAlarm, pi);
            }            

           AlarmReceiver.completeWakefulIntent(intent);
}

Receiver:

public class AlarmReceiver extends WakefulBroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {    
    Log.e("test","onReceive started");    
    Intent i = new Intent(context,NotificationService.class);               
    startWakefulService(context,i);
}
}

When the screen is locked and app is in the background receiver is never started since i cant see the line : Log.e("test","onReceive started"); executed

I do have WAKE_LOCK permission in manifest

score 0 · Answer 1 · edited May 23 '17 at 12:16

0

You can check an excellent example of using AlarmManager here.

Is it possible for my alarm in AlarmManager to work after app is killed?

AlarmManager is intended to work even after the app is killed.

edited May 23 '17 at 12:16

Community

1
1

answered Sep 21 '16 at 01:41

Saeed Jassani

1,079
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Use the code in the link.. It should not happen... you might be doing something wrong – Saeed Jassani Sep 21 '16 at 02:15

Andres Vasquez Agramont · Answer 2 · 2016-09-21T02:58:08.083

You have to consider add:

<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.VIBRATE" />

Permissions to manifest and add the functionality on your notification IntentService to verify that your notification is fired.

So you can use a JobScheduler service:

JobScheduler jobScheduler =
                (JobScheduler) getSystemService(Context.JOB_SCHEDULER_SERVICE);

        if (!enabled) {
            jobScheduler.cancel(JOB_ID);
            Log.d(TAG, "cancelling scheduled job");
        } else {
            long interval = AlarmManager.INTERVAL_DAY;
            JobInfo job = new JobInfo.Builder(JOB_ID,
                    new ComponentName(getPackageName(),
                            ScheduledJobService.class.getName()))
                    .setPersisted(true)
                    .setPeriodic(interval)
                    .build();

            jobScheduler.schedule(job);
            Log.d(TAG, "setting scheduled job for: " + interval);

And

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public class ScheduledJobService extends JobService {
@Override
public boolean onStartJob(JobParameters params) {
    startService(new Intent(this, NotificationService.class));
    return false;
}

@Override
public boolean onStopJob(JobParameters params) {
    return false;
}

}

I don't want to use JobScheduler because I want my app to work on devices previous to API 21 — matip, Sep 21 '16 at 14:11

AlarmManager or WakefulBroadcastReceiver doesn't work when screen is locked AND app is in background on some devices

2 Answers2